Fan



July 5, 1932.

Filed Aug; 16. 1929 L. M. PERSONS FAN l 2 Sheets-Sheet 1 July 5, 1932. vL. M. PERSONS FAN Filed Aug. 1e. 1929 2 sheets-sheet z Patented July 5,1932 I* UNITED-- f oFF-ICE l V;- LAURENCE M. PERSONS, orsr.:LoUIs,MIssUEI;iiAssIeNR To EMERSON ELECTEI 1,5.

MANUFACTURING 100;, 4oEsfr. LOUIS,` IyIIssoUEI, A CORPORATION" 0EMISSOURI FAN i Application tiled". Augvuistl, 1929. Serial i110..l386,898.1

My invention relates to animprove'ment in` Ventilating systems and in`fans"operable 'in' connectiontherewith. One object is to prof vide animproveddrive WhichV is adaptable',

among other uses, to drive a'du lexpfan.

' duplex fan is* associatedwith'a'du'ct orpluf ralityof ducts, throughlwhichthe-"arris adapted to draw or drivevair or gases orfthe Alike. Atypical application'of my.V invention is'y its use inv connectionWith-the supply'yof air for heating toy a domestic furnace, 'the air,after it is heated, beingreturned to one or Vmore points throughoutadwelling.v y

I illustrate my invention more .or lessdia-l grammatically in theaccompanying drawings, Wherein-" f A Figure l isa side elevationvvithparts` vertical section;V f s -1 Figure 2 is an elevz'itionwofV a motoron an enlarged scale,V with parts in axial section; and

S-SofFigure 2.' f w Like partsare indicated by like [symbols throughoutthe specifcationfandidrawings;

Referring to the draw/ings;Y for example to Figure Vl, A generally anddiagrammatijcally' indicates a furnace with the outer jacket A1l and theheated air ducts A2. A3 indicates a cold lairv return duct and A? apassageadapt-j ed to connect the cold air 0r connection 'duct' A3 withthe furnace'A.

B generally indcate'sa; motor -whi' :h isi5A shownin Figure 1 asadjustably 'mounted'v upon the stem B1; as' bythe sleeve SBZ and theAadjusting orlocki-ng screwl 4B3. The-` sterft-li1i is shown inFigurel'asprojectingupwardly through the Wallfof the passage A4,..beingj externally supported as 'upon the base'B-Ll VReferri-ng'toFigures 2' andf which illus trate the structure ingreateride'tail,Cisthe l motor shaft which,` it `is understood,isf'rotated constant direction of rotation. 'Mounted d kabout it .ist-he'sleeve or extension which ifs-locked thereto as, by thel screw C2Passing' throughftlie collar Ci. C4 any suite blleanti# friction memberorV Washe'rg'the purpose f yfor Which'will later appear. VC5 indicatesahead at thefouter' end ofthesleeve C1' spaced out- Y Wardly `beyond theend ofthe stub shaftC.' tis vprovided Witha shoulder C? and a 'seatportion- C@ of less diameter than theshoulder,j l

ssl

andindicated as generallly:cylindrical-.vy The seat` Cf isa'dapted toreceiverjthe inner ball krace D which may be thrust againstthe' shoulderC?, Vas by thev lock nuts or locking members C85 screwthreaded upon ythe exten'-4 VsionC?` ofthe head VCfnThis extensioiiis axially aperturedoryindented asiat' Cwfj the Y purposeoff which Vaperture vwill laterappear;Y

f Opposed to theinnerball raceD is the outerv iban: race D11 1 'fletween-,v the twoi ball Y races are' positioned,` in noperativeContacty tvithfthe races',"aplu`rality of balls' or roll members D2.

stood that' vvhile` I prefer to'employlballsl dol not'lwishtofbelimited5except so yfaresu I limit myself bythe language of myclaims.

to these particular rolling members orto this' particularv dispositionthereof."` D3`geerally indicates a'sleeve rotatableabout the eyli anextension l)4v which may be forked or reef cessed or notched a'satDustoreceive theballs D2.,v Themember D? i'sshown as confined, on

the shaft Vbetween the Washers C* atone endktand the Washer 'or' WashersD` atthe" example'ibyi'the screw member D1 It` ivillbef understood nthat any suitableV lubricantI Afoi" example grease may be'insertedLIinthe ca-,vitl'yi Dvjtoflubri'cate" the opposed? bearing'sur'facesotthe sleeves? 'C11 and i133'. The Awashers C? .,n v For; pero@ f.,illustratie- Y shovg'f` a *single serie'sfofballs', itbeing under-Figure 3 isla transverse sectionVY on theline A #o drical'ex'terior ofthe sleeve'fC1 andincludes and D6 are preferably of copper materialtoconfine or prevent the escape of the lubricant from between the opposedbearing surfaces.

Associated with the outer ball race D1 is a housing structure Vgenerallyindicated V'as E. It is provided with a seat E1 to receive the outerball race D1 and is clamped in position thereon for example byengagement with the member E2 which is drawn againstvthe member E as bythe screws or bolts E3. The member E2 is provided with theinwardextension E4L within'xwhich is any suitableK4 washer or packingmeans E5 confined as by thering or angle E6. The member E hasscrewtlireaded into itthe axially located hub member E7 whichl isaxially apertured as, at E8 to receivethe compression spring E9 whichexerts a thrust against the single ball E10 positioned in the recess C10of the member` C.

Positioned on the hub E9 are the fan me`n1-V bers G and` positioned* on,thesleeve l)3 are the fan members G1. It will be understood that thesefan members are of opposite pitch,

since they rotate in opposite directions.

' It will be realized that whereas I have described and shown apractical and operative device, lnevertheless many changes might be Ymade in the size, shape, number and disposition of parts withoutdeparting from the spirit of my invention. I therefore wish mydescription' and drawings to be'talren as in a broad sense illustrativeand diagrammatic rather than asV limiting me to my specific showing. A il The use and operation of myinvention are Y as follows For manypurposes, for example, kfor maintaining a circulation ofl air in. adomestic hot air heating plant, it is desirable to employ a fanpositioned within a ductk or confined space. I prefer to employ aduplexfan in which twol fan elements ortwo sets of fan elements, ofopposite pitch,are simultanei ously'rotated in opposite directions.' Theresult is an increased efficiencyl ordelivery of air through a duct ofgiven diameter, as compared to the V,air deliveryofa single fan op-Verating at lilespeeds Vof rotation. 'Owing to the employment of two setsof blades which supplementeach othera breeze'is created,the

penetration of which, fora given power out- 't put is greater thanintheprior'art form of fan in which a single rotating member or setv ofblades `is employed. Owing to the em-` ployment oftwo sets of blades,the speedof the motor, for a given delivery'of air, can be greatlyreduced. Each'set maybe driven at, say, half the number of rotationspermin sur' ute of the ordinary fan by employinga single set of blades.The reduction in the speed ofA thew'motor and the reduction'inthespeedof x rotationofzthe fan membersthus result in avery quietoperation. A greater delivery of air is producedby a fan Vofgiven-dialnet,er

Y 6,75 Vand a spiral effect, which is alimiting factor-V in the simpledisc or single fan set type is eliminated.

Referring specifically to the details of the present form it has for oneadvantage that the two fan elements and the'power transmission thereforcan be'fastened directly to a motor shaft and no additional abutments orconnections are necessary. This is a great advantage in setting up sucha fan for use in an air or gas duct, as shown in Figure 1.

The principle of driving the fan elements simultaneouslyinbothfdirections has great advantage over positive drive through gear Vorbelt. The ball bearing serves as a planetary transmission, rotation in.one direction being maintained from the gauge or balli retainer, themember D3 D", and rotation in the opposite Ydirection being taken fromthe outer race, through the member E. The inner race isfthe drivingmember, rotating in unison withr the shaft C. The sleeveD` rotates aboutthe shaftC, and in alike direction of rotation. YThe extension D* servesas theball retainer. The ball E10, thrust by the spring E, serves tokeepvthe balls and races in firm Contact, preventing]v slippage; WhereasI have described and-shown this improved transmission in connection.with aduplex fan it. will be realized that other applications thereofor uses thereforv are available.

It will be understood thatwhereas I have shown bearing ballsor spheresand a single rollers, said retainer including a portion ro- -tatableabout said extension sleeve, a work performing element'connected withsaid retainer and a'work performing element connected with said outerrace.`

2. The'structure ofclaim 1 characterizedv by the employment of a housingadapted to surround the krollers and the races therefor, 'the workperforming elementassociated with 'the outer race being secured to saidhousing, .f saidhousing being secured in relation lto the outer'race. 7.Y

3. The structurejofcclaim 1 characterized by' thel provision; of alubricant 'container associated withsaid retainer.

Y 4. In a power transmitting-mechanism V'adapted to drivefans inopposite rotational l. -direction's,,a Vmotor and. a'motor shaft,an

extension 'sleeve YYmounted on said shaft, an

inner race mountedon said extension;sleeve,l

an outer race opposed thereto, rollers interposed therebetween, a.rotatableretainer for said rollers, said retainer including a. portionrotatable about said extension sleeve, a work performing elementconnected with said retainer, a housing structure connected with theouter race, and means connected therewith for holding rollers andracesin Afirmvr Contact.

Signed at St.

this 1st day of August, 1929. o

' LAURENCE M. PERSONS.

Louis, State of Missouri,

